Sustainable Heritage-Sensitive Addition and Renovation
This recent addition and renovation to a Heritage Peterborough home is constructed almost entirely of local and/or renewable materials and is loaded with sustainable features including solar thermal panels, a grid-connected solar electric system and trenched geothermal heating.
The original house was built across the street from Little Lake in 1862. It was the first severance to the 100 acre allotment owned by Rev. R.S. Burnham and was the first house built on Maria St in Peterborough. "It was very important that the addition respected the original flavour of the house", says client Simon Boone, who recently pursued Heritage Designation for this nearly 150 year old home. The gingerbread details on the front porch, likely added in the 1900s, and the stacked wood construction method of the original house are historically significant in the area.

Because the house was so small, 700 SF, it was important the new addition, 1200 SF, did not visually dwarf the original house. The workshop to the east of the house was placed on the lot to allow for this addition. The roof lines of the new addition reflect both the lines of the original front porch as well as the dormer on the workshop.
Like the original house, the addition is timber construction built with locally harvested and milled White Pine. Diagonal braces are reclaimed Douglas fir, salvaged from a Prince Edward County industrial building that was being demolished. The floors are milled locally from local White Pine and Butternut.

Local and/or eco-sensitive building materials were used everywhere possible throughout the construction. Some of these materials include structurally insulated panel footings and roof structure, plastered and compressed earthblocks for interior walls, locally produced eco-sensitive spray foam insulation, and a vented, reflective steel roof. All of these help to enhance the thermal performance of the building and also have a low environmental impact. The cove siding is harvested and milled locally to match the siding of the original house.
Radiant floor heat was installed throughout the entire main floor and basement of addition. Water radiators were installed in upper level of addition as well as retrofitted to original house. The finished interior has a seamless floor height throughout entire house, across wood, concrete, and tile flooring.
Radiators and radiant floor are fed by a 3 ton geothermal unit with a trenched ground loop containing 1800' of piping. The thermal mass in the house - timbers, earthblocks, concrete, and tile - helps buffer seasonal humidity and absorbs natural heat from the sun. This allows the geothermal unit to run much more efficiently, operating at only 110F. The unit also has a de-superheater to generate domestic hot water. The ground loop is made up of 3 x 300' trenches, each 6' deep and 2' wide. With some creative digging it was possible to squeeze all 1800' of pipe in the 75' x 100' backyard.

The addition has a rooftop solar thermal system that, in combination with the geothermal system, supplies all of the hot water to the house throughout the year. It also has a battery-less solar electric system that directly supplies the hydro grid energy at a premium rate through the province's microFIT program. "We generate enough revenue from the sale of electricity to pay for the hydro and water that our home consumes," says Mr. Boone. Thus, the house has no need for natural gas or oil. It provides more clean energy than the energy it consumes.



by Dave LeBlanc, "












